JP2007051771A - Method of manufacturing dynamic pressure bearing - Google Patents

Method of manufacturing dynamic pressure bearing Download PDF

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Publication number
JP2007051771A
JP2007051771A JP2006186661A JP2006186661A JP2007051771A JP 2007051771 A JP2007051771 A JP 2007051771A JP 2006186661 A JP2006186661 A JP 2006186661A JP 2006186661 A JP2006186661 A JP 2006186661A JP 2007051771 A JP2007051771 A JP 2007051771A
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Prior art keywords
plate
manufacturing
hydrodynamic bearing
bearing according
bearing
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JP2006186661A
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Japanese (ja)
Inventor
Hsiu-Wei Wu
修維 呉
Wen-Hsi Huang
文喜 黄
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Taida Electronic Industry Co Ltd
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Taida Electronic Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/026—Sliding-contact bearings for exclusively rotary movement for radial load only with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F16C2220/44—Shaping by deformation without removing material by rolling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49639—Fluid bearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49643—Rotary bearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49643—Rotary bearing
    • Y10T29/49647—Plain bearing
    • Y10T29/49648—Self-adjusting or self-aligning, including ball and socket type, bearing and component making
    • Y10T29/49657—Socket making
    • Y10T29/49663—Socket making by assembling

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Sliding-Contact Bearings (AREA)
  • Forging (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a dynamic pressure bearing relatively low in manufacturing cost without the need for using special machining tools. <P>SOLUTION: The method of manufacturing the dynamic pressure bearing 2 comprises steps of providing a plate 1, forming a plurality of grooves 10 on the surface of the plate 1, and bending the plate 1 in hollow cylindrical shape. The plurality of grooves 10 are formed to be located on the inner surface of the bent plate 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、動圧軸受の製造方法に関し、特に、プレートに溝を先に形成した後に、当該プレートを曲げて円筒状の軸受を製造する方法に関するものである。   The present invention relates to a method of manufacturing a hydrodynamic bearing, and more particularly to a method of manufacturing a cylindrical bearing by bending a plate after first forming a groove in the plate.

特許文献１に示すように、従来におけるモーターの回転軸を保持するような動圧軸受は、通常、軸受の内穴壁上に幾つかの微細な溝を有し、且つ、前記溝内に潤滑油を有するものである。モーターの回転軸が回転した時、溝内の潤滑油が引き出されて前記軸と軸受との間に分布し、動圧を発生する。これが軸と軸受の間の摩擦を防ぎ、モーターの信頼度を高め、雑音を減少することができる。   As shown in Patent Document 1, a conventional dynamic pressure bearing that holds a rotating shaft of a motor usually has several fine grooves on the inner hole wall of the bearing, and lubricates the grooves. It has oil. When the rotating shaft of the motor rotates, the lubricating oil in the groove is drawn out and distributed between the shaft and the bearing to generate dynamic pressure. This prevents friction between the shaft and the bearing, increases the reliability of the motor, and reduces noise.

しかし、軸受の内孔における溝の加工は、溝の幅と深さが非常に小さいことから、かなり困難である。例えば、すり割り治具（tooling），ローリング（rolling），プラスチック射出，エッチング，コンビネーション（combination），製造後のめっき加工などのいくつかの加工方式が提供されているが、これらの方式は、特殊な加工器具と技術を用いなければならないことから製造コストが高い。
特開平１０−１４１３５８号公報 However, the machining of the groove in the inner bore of the bearing is rather difficult because the groove width and depth are very small. For example, several processing methods such as tooling, rolling, plastic injection, etching, combination, and post-manufacturing plating are provided. These methods are special Manufacturing costs are high because of the use of complex processing tools and techniques.
JP-A-10-141358

本発明は、上述した高コストの動圧軸受の製造方法における欠点に対し、特殊な加工器具を用いる必要なく、製造コストも比較的低い動圧軸受の製造方法を提供する。   The present invention provides a method for manufacturing a hydrodynamic bearing that does not require the use of a special processing tool and has a relatively low manufacturing cost, in response to the above-described drawbacks in the method for manufacturing a high-cost hydrodynamic bearing.

本発明の主な目的は、次の各ステップからなる動圧軸受の製造方法を提供することである。まず、既定の大きさを有する軸受のプレートを準備する。次に、前記プレートの表面に複数の溝を形成し、前記プレートを中空円筒状に曲げる。前記複数の溝は、前記曲げられたプレートの内側表面に位置する。最後に、この曲げられたプレートをスリーブの配部に設置する。本発明は、プレートに先ず溝を形成した後に、前記プレートを一般の軸受のような中空円筒形状に曲げることができる。製造方式は、従来に比べ簡単で、コストも低い。   The main object of the present invention is to provide a method of manufacturing a hydrodynamic bearing comprising the following steps. First, a bearing plate having a predetermined size is prepared. Next, a plurality of grooves are formed on the surface of the plate, and the plate is bent into a hollow cylinder. The plurality of grooves are located on an inner surface of the bent plate. Finally, the bent plate is installed in the sleeve section. In the present invention, after the groove is first formed in the plate, the plate can be bent into a hollow cylindrical shape like a general bearing. The manufacturing method is simpler and less expensive than the conventional method.

上述の目的に基づいて、前記プレートは、完成したい軸受のサイズの大きさと、円周の長さと、孔径の大きさで決める。   Based on the above-mentioned purpose, the plate is determined by the size of the bearing to be completed, the length of the circumference, and the size of the hole diameter.

上述の目的に基づいて、前記プレートの材料は、曲げることができる可撓性の材料であれば適用できる。   Based on the above-mentioned purpose, the material of the plate can be any flexible material that can be bent.

上述の目的に基づいて、前記プレートの材料が金属の場合、プレートの表面にすり割りを入れる治具を用いて前記プレートに溝を削り出したり、またはパンチプレス機（punch machine）を用いて溝をプレスしたりすることができる。   Based on the above-mentioned purpose, when the material of the plate is a metal, a groove is cut out on the plate using a jig for slitting the surface of the plate, or a groove is formed using a punch machine. Can be pressed.

上述の目的に基づいて、前記プレートの材料がプラスチックの場合、射出成形を用いて溝を形成する。   Based on the above-mentioned purpose, when the material of the plate is plastic, the groove is formed by injection molding.

上述の目的に基づいて、前記曲げられた後のプレートは、前記スリーブ内の軸孔に直接配置され、または複数の分離可能なスリーブのパーツを、前記軸受の外部から前記軸受を挟んで互いに組み立てて形成される。   Based on the above-mentioned object, the bent plate is directly arranged in the shaft hole in the sleeve, or a plurality of separable sleeve parts are assembled to each other across the bearing from the outside of the bearing. Formed.

本発明の特徴は、溝を有するプレートを先に製造した後に、前記プレートを必要な軸受の形状に曲げることにあり、よって、特殊な器具を用いる必要がなく、製造コストも削減できる。   The feature of the present invention is that after a plate having grooves is first manufactured, the plate is bent into a necessary bearing shape, so that it is not necessary to use a special instrument and the manufacturing cost can be reduced.

本発明についての目的，特徴，長所が一層明確に理解されるよう、以下に実施形態を例示し、図面を参照にしながら、詳細に説明する。   In order that the objects, features, and advantages of the present invention will be more clearly understood, embodiments will be described below in detail with reference to the drawings.

本発明の動圧軸受の製造方法は、図１に示すように、完成したい軸受のサイズの大きさと、円周の長さと、孔径の大きさとに基づいて、長方形のプレート１を先に準備する。前記プレート１の材料は、曲げることができる可撓性の材料であればよく、金属またはプラスチックとすることができる。よくある軸受材料は、金属としての銅である。   As shown in FIG. 1, the method for manufacturing a hydrodynamic bearing according to the present invention first prepares a rectangular plate 1 based on the size of the bearing to be completed, the length of the circumference, and the size of the hole diameter. . The material of the plate 1 may be a flexible material that can be bent, and may be metal or plastic. A common bearing material is copper as a metal.

次に、図２に示すように、前記プレート１の表面に複数の溝１０を形成する。前記溝１０の形状は、従来の溝の任意の形状であることができる。本実施例では、魚骨（フィッシュボーン）状の溝を用いて説明を行う。注意するのは、前記プレート１０の材料が金属の場合、プレート１の表面にすり割りを入れる治具を用いて前記プレート１に溝１０を削り出したり、またはパンチプレス機（punch machine）によって溝１０をプレス成形したりすることができる。前記プレート１０の材料がプラスチックの場合、射出成形を用いて前記溝１０を形成することができる。   Next, as shown in FIG. 2, a plurality of grooves 10 are formed on the surface of the plate 1. The shape of the groove 10 may be any shape of a conventional groove. In the present embodiment, description will be made using a fishbone-like groove. It should be noted that when the material of the plate 10 is a metal, the groove 10 is cut out on the plate 1 using a jig for slitting the surface of the plate 1, or the groove is formed by a punch press machine. 10 can be press-molded. When the material of the plate 10 is plastic, the groove 10 can be formed by injection molding.

最後に、図３に示すように、前記溝１０を有するプレート１を中空円筒状に曲げるローリングプロセスを行い、動圧軸受２の製造を完成する。前記動圧軸受２に形成された内孔２０は、軸（図示せず）を挿通させて受ける。また、複数の溝１０は、曲げられたプレート１の内側をなす内孔２０の表面に形成される。   Finally, as shown in FIG. 3, a rolling process for bending the plate 1 having the groove 10 into a hollow cylindrical shape is performed to complete the manufacture of the hydrodynamic bearing 2. The inner hole 20 formed in the hydrodynamic bearing 2 is received by inserting a shaft (not shown). The plurality of grooves 10 are formed on the surface of the inner hole 20 that forms the inside of the bent plate 1.

図４を参照すると、通常、実際に前記動圧軸受２を用いる時、前記動圧軸受２をスリーブ３の内部に配置する。図４に示すように、前記動圧軸受２を前記スリーブ３の軸孔３０の内部に直接配置する他に、図５に示すように、複数の分離可能なスリーブ４のパーツ４ａ，４ｂにより、前記軸受２の外側から前記軸受２を囲み込むように覆い挟み、これらのパーツ４ａ，４ｂを互いに組み立ててスリーブ４を形成することもできる。   Referring to FIG. 4, normally, when the dynamic pressure bearing 2 is actually used, the dynamic pressure bearing 2 is disposed inside the sleeve 3. As shown in FIG. 4, in addition to arranging the dynamic pressure bearing 2 directly in the shaft hole 30 of the sleeve 3, as shown in FIG. 5, a plurality of separable sleeve 4 parts 4 a and 4 b, The sleeve 4 can be formed by covering the bearing 2 from outside the bearing 2 and assembling these parts 4a and 4b together.

本発明の特徴は、溝を有するプレートを先に製造した後に、前記プレートを必要な軸受の形状に曲げることにあり、よって、特殊な器具を用いる必要がなく、製造コストも削減できる。加えて、プレート１の形状は、図１に示す長方形に限らず、図６に示すように、前記プレート１が前記ローリングプロセス中に両端部を互いに接合できれば、あらゆる形状に形成することができる。また、本発明に用いる前記溝１０の形状は、ブーメラン状（図７），ヘリンボーン状（図８），斜線状，または直線状などに形成することもできる。   The feature of the present invention is that after a plate having grooves is first manufactured, the plate is bent into a necessary bearing shape, so that it is not necessary to use a special instrument and the manufacturing cost can be reduced. In addition, the shape of the plate 1 is not limited to the rectangle shown in FIG. 1, and as shown in FIG. 6, the plate 1 can be formed in any shape as long as both ends can be joined to each other during the rolling process. Further, the shape of the groove 10 used in the present invention may be formed in a boomerang shape (FIG. 7), a herringbone shape (FIG. 8), a slanted line shape, or a straight line shape.

以上、本発明の好適な実施例を例示したが、これは本発明を限定するものではなく、本発明の精神及び範囲を逸脱しない限りにおいては、当業者であれば行い得る少々の変更や同等の装置を付加することは可能である。従って、本発明が保護を請求する範囲は、特許請求の範囲を基準とする。   The preferred embodiment of the present invention has been described above, but this does not limit the present invention, and it is possible to make a few modifications and equivalents that can be made by those skilled in the art without departing from the spirit and scope of the present invention. It is possible to add these devices. Accordingly, the scope of the protection claimed by the present invention is based on the scope of the claims.

本発明の動圧軸受におけるプレートの実施例を示す概略図である。It is the schematic which shows the Example of the plate in the dynamic pressure bearing of this invention. 図１のプレートに溝を形成した概略図である。It is the schematic which formed the groove | channel in the plate of FIG. 図２のプレートが中空円筒状に曲げられた軸受の概略図である。It is the schematic of the bearing by which the plate of FIG. 2 was bent by the hollow cylinder shape. 図３で形成された動圧軸受がスリーブに設置されたことを示す概略図である。FIG. 4 is a schematic view showing that the hydrodynamic bearing formed in FIG. 3 is installed on a sleeve. 複数の分離可能なスリーブのパーツによって図３の動圧軸受が挟まれていることを示す概略図である。It is the schematic which shows that the hydrodynamic bearing of FIG. 3 is pinched | interposed by the part of several separable sleeves. 本発明における動圧軸受となるプレートのもう１つの実施例である。It is another Example of the plate used as the dynamic pressure bearing in this invention. 図６のプレートに溝を形成した概略図である。It is the schematic which formed the groove | channel in the plate of FIG. ヘリンボーン形状の溝を備えて形成されたプレートの概略図である。It is the schematic of the plate formed with the herringbone-shaped groove | channel.

符号の説明Explanation of symbols

１ プレート
２ 動圧軸受
３ スリーブ
１０ 溝
２０ 内孔
３０ 軸孔
４，４’ スリーブのパーツ

1 Plate 2 Hydrodynamic Bearing 3 Sleeve 10 Groove 20 Inner Hole 30 Shaft Hole 4, 4 'Sleeve Parts

Claims (10)

プレートを提供するステップと、
前記プレートの表面に複数の溝を形成するステップと、
前記プレートを中空円筒状に曲げるステップとを含み、
前記複数の溝は、前記曲げられたプレートの内側表面に位置する動圧軸受の製造方法。 Providing a plate;
Forming a plurality of grooves on the surface of the plate;
Bending the plate into a hollow cylinder,
The method for manufacturing a hydrodynamic bearing, wherein the plurality of grooves are located on an inner surface of the bent plate. 前記プレートの材料は、金属またはプラスチックである請求項１に記載の動圧軸受の製造方法。   The method for manufacturing a hydrodynamic bearing according to claim 1, wherein a material of the plate is metal or plastic. 前記プレートの両端部は、互いに接合できる請求項１に記載の動圧軸受の製造方法。   The method for manufacturing a hydrodynamic bearing according to claim 1, wherein both end portions of the plate can be joined to each other. 前記溝の形状は、フィッシュボーン状，ヘリンボーン状，ブーメラン状，斜線状，または直線状である請求項１に記載の動圧軸受の製造方法。   The method of manufacturing a hydrodynamic bearing according to claim 1, wherein the groove has a fishbone shape, a herringbone shape, a boomerang shape, a diagonal line shape, or a straight line shape. 前記溝は、前記プレートの前記表面にすり割りを入れる治具によって削り出し形成され、またはパンチプレス機によって形成され、または射出成形によって形成される請求項２に記載の動圧軸受の製造方法。   The method for manufacturing a hydrodynamic bearing according to claim 2, wherein the groove is formed by being cut out by a jig for slitting the surface of the plate, formed by a punch press, or formed by injection molding. 前記プレートを曲げるステップの後、前記曲げられたプレートをスリーブ内に配置する請求項１に記載の動圧軸受の製造方法。   The method of manufacturing a hydrodynamic bearing according to claim 1, wherein the bent plate is disposed in a sleeve after the step of bending the plate. 前記曲げられたプレートは、前記スリーブの軸孔の内部に直接、配置される請求項６に記載の動圧軸受の製造方法。   The method of manufacturing a hydrodynamic bearing according to claim 6, wherein the bent plate is arranged directly inside the shaft hole of the sleeve. 前記スリーブは、複数のパーツより構成される請求項６に記載の動圧軸受の製造方法。   The method of manufacturing a hydrodynamic bearing according to claim 6, wherein the sleeve is composed of a plurality of parts. 前記複数のパーツを、前記曲げられたプレートの外側から覆い、前記スリーブを組み立てる請求項８に記載の動圧軸受の製造方法。   The method for manufacturing a hydrodynamic bearing according to claim 8, wherein the plurality of parts are covered from the outside of the bent plate and the sleeve is assembled. 互いに対応する端部が相互に接合できるプレートを提供するステップと、
前記プレートの表面に複数の溝を形成するステップと、
前記プレートの前記互いに対応する端部を接合して動圧軸受を形成するステップを含む動圧軸受の製造方法。 Providing a plate whose ends corresponding to each other can be joined together;
Forming a plurality of grooves on the surface of the plate;
A method of manufacturing a hydrodynamic bearing, comprising the step of joining the corresponding ends of the plate to form a hydrodynamic bearing.
JP2006186661A 2005-08-19 2006-07-06 Method of manufacturing dynamic pressure bearing Pending JP2007051771A (en)

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TW094128354A TWI257977B (en) 2005-08-19 2005-08-19 Dynamic bearing manufacturing method

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WO2012173223A1 (en) * 2011-06-15 2012-12-20 Ntn株式会社 Multilayer bearing manufacturing method and multilayer bearing
KR20170121966A (en) * 2016-04-26 2017-11-03 한국기계연구원 Hydro/Hydraulic Power Application Cylindrical Turbine Guide Bearing for Low-Load/Low-Eccentricity Performance Improvements

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US1924230A (en) * 1932-01-14 1933-08-29 Moraine Products Company Method of making bushings from strip metal
JP2963652B2 (en) * 1995-02-07 1999-10-18 株式会社椿本チエイン Rolled product for chain and manufacturing method
US6095690A (en) * 1996-01-30 2000-08-01 Glyco-Metall-Werke Glyco B.V. & Co. Kg Sliding bearing element with lubricating oil pockets

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Publication number Priority date Publication date Assignee Title
WO2012173223A1 (en) * 2011-06-15 2012-12-20 Ntn株式会社 Multilayer bearing manufacturing method and multilayer bearing
JP2013002517A (en) * 2011-06-15 2013-01-07 Ntn Corp Multilayer bearing manufacturing method and multilayer bearing
KR20170121966A (en) * 2016-04-26 2017-11-03 한국기계연구원 Hydro/Hydraulic Power Application Cylindrical Turbine Guide Bearing for Low-Load/Low-Eccentricity Performance Improvements
KR101868497B1 (en) * 2016-04-26 2018-06-18 한국기계연구원 Hydro/Hydraulic Power Application Cylindrical Turbine Guide Bearing for Low-Load/Low-Eccentricity Performance Improvements

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